DISCUSSION ON GEOCHEMICAL BEHAVIORS OF SOME METALLIC ELEMENTS IN COMPANION SEDIMENTS FOR MANGANESE NODULES IN NORTH PACIFIC

By contrasting the data of elemental analysis to that of water depth, it may be found that most of the contents of metallic elements gradually increase with the increasing depth, excep for the contents of Ca and Sr, which decrease inversely, and that changes in types of sediments take place, as well as the abundance of manganes nodules differs from one to another.By means of analysis of companion sediments in the following items such as contents of metallic elements, constituents of clay, and contents of organic matters, it can also be found that the content of metallic elements is in direct proportion to either the constituents of clay or the contents of organic matters.It can be seen from the analysis of samples each with the same sedimentary grain size that contents of most metallic elements from the clay grade are higher than that in raw samples, and at the same time, the work in comparison of ratio of abundance for manganese nodules with the above mentioned results has been carried out.It can b seen from analysis of samples treated by different methods that contents of metallic elements in clay, of which the organic matters had been extracted, generally reduce. The phenomena, as stated earlier, show that the clay material is not noly an important carrier for the envionmnt of some metallic ele-ments in ocean sediments, but also the carrier for the organic matters enrichment and that since a part of metallic elements is closely bonding with the organic matters so that the conditions for formation of those manganese nodules have beencreeted.